diff --git a/frontend/src/pages/PostIntent.jsx b/frontend/src/pages/PostIntent.jsx
index 1a84a0a..9cb2102 100644
--- a/frontend/src/pages/PostIntent.jsx
+++ b/frontend/src/pages/PostIntent.jsx
@@ -56,7 +56,7 @@ export default function PostIntent() {
       otherPoint,
       earliestTime: new Date(earliestTime).toISOString(),
       latestTime: new Date(latestTime).toISOString(),
-      maxFare: maxFare ? Number(maxFare) : null,
+      maxFare: maxFare ? Number(maxFare) : undefined,
     };
 
     try {
diff --git a/frontend/src/pages/PostRide.jsx b/frontend/src/pages/PostRide.jsx
index 898499c..1014d2e 100644
--- a/frontend/src/pages/PostRide.jsx
+++ b/frontend/src/pages/PostRide.jsx
@@ -55,7 +55,7 @@ export default function PostRide() {
       departureTime: new Date(departureTime).toISOString(),
       seatsTotal: Number(seatsTotal),
       farePerHead: Number(farePerHead),
-      notes: notes.trim() || null,
+      notes: notes.trim() || undefined,
     };
 
     try {